Zircon U-Pb Geochronology Constrains Continental Expression of Great Meteor Hotspot Magmatism
Affiliation
Department of Geosciences, University of ArizonaIssue Date
2021Keywords
CretaceousEastern North American Margin
Great Meteor Hotspot
hotspot magmatism
Mesozoic
zircon U-Pb geochronolgy
Metadata
Show full item recordPublisher
Blackwell Publishing LtdCitation
Kinney, S. T., MacLennan, S. A., Keller, C. B., Schoene, B., Setera, J. B., VanTongeren, J. A., & Olsen, P. E. (2021). Zircon U-Pb Geochronology Constrains Continental Expression of Great Meteor Hotspot Magmatism. Geophysical Research Letters, 48(11).Journal
Geophysical Research LettersRights
Copyright © 2021 American Geophysical Union. All Rights Reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The New England-Québec Igneous Province is considered to be a continental expression of Great Meteor Hotspot magmatism, though other geodynamic scenarios have been suggested. Existing geochronologic data lack the needed accuracy and precision to permit tests of potential causal mechanisms. We provide zircon U-Pb ages for four igneous centers and a suite of plate reconstructions and show that the duration between magmatism in each branch of this province is ca. 3–6 Myr shorter and ca. 10 Myr older than predicted if the spatial-temporal distribution of magmatism conformed to a well-defined age progression. However, in addition to uncertainties in plate reconstructions, variable regional crustal thickness or lithospheric topography likely played a role in mediating the rates of melt transport to emplacement depth and we therefore cannot reject the hotspot hypothesis. Our results place the best-available chronological constraints on continental magmatism associated with one of the oldest and longest-lived hotspots. © 2021. American Geophysical Union. All Rights Reserved.Note
6 month embargo; published online: 05 June 2021ISSN
0094-8276Version
Final published versionae974a485f413a2113503eed53cd6c53
10.1029/2020GL091390